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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. See the documentation for help with subscribing to or submitting Circulars.

Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search

To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

45719 results found.

  1. GRB 090817: Swift/UVOT Observations of a Host Galaxy Candidate
  2. GRB 090820: MASTER-Net optical polarization observations
  3. GRB 090820: Fermi GBM Detection of a bright burst.
  4. GRB 090817: aphotometry of USNO-B1.0 341-0096763
  5. GRB 090817: Liverpool Telescope Observations
  6. GRB 090817: optical upper limit
  7. GRB 090817: Confirmation of the X-ray afterglow
  8. GRB 090815C: Swift refined analysis
  9. GRB 090817: Fermi GBM observation
  10. GRB 090817: Swift/UVOT Upper Limits
  11. GRB 090812: Konus-Wind and Swift/BAT joint spectral analysis
  12. GRB 090813: I-band observations from 1.5m OSN telescope
  13. GRB 090817: Swift-XRT observations
  14. GRB 090814A: optical observations
  15. GRB 090813: Suzaku WAM observation of the prompt emission
  16. GRB 090812: Suzaku WAM observation of the prompt emission
  17. GRB 090817: a long GRB localized by INTEGRAL
  18. VLA radio non-detection of GRB 090812
  19. GRB 090815B: Fermi GBM detection
  20. GRB 090815: Fermi GBM detection
  21. GRB 090813: CrAO optical obsevations
  22. GRB 090814B: Confirmation of the X-ray afterglow
  23. GRB090814A: NOT optical follow-ups
  24. GRB 090814B: I-band observations from 1.23m CAHA telescope
  25. GRB 090814B: Swift/UVOT Upper Limits
  26. GRB 090814B: Liverpool Telescope Observations
  27. Fermi Gamma-ray Burst Monitor trigger 271934815 is not a GRB
  28. GRB 090814C: Fermi GBM detection
  29. GRB 090814B: Swift-XRT detection of a possible afterglow.
  30. GRB 090814A: Swift/UVOT Observations
  31. GRB 090814A: Swift-XRT Team Refined Analysis
  32. GRB 090814A, RIMOTS optical upper limits
  33. GRB 090814A: Swift-BAT refined analysis
  34. GRB 090813: correction to GCN 9787
  35. GRB090814A: VLT spectroscopy
  36. GRB 090814: Enhanced Swift-XRT position
  37. GRB 090814B: a long GRB localized by INTEGRAL
  38. GRB 090814: GROND Detection of an Optical Afterglow Candidate
  39. GRB 090814: Swift detection of a burst
  40. GRB 090813: Fermi GBM observation
  41. Fermi Gamma-ray Burst Monitor trigger 271446248 is not a GRB
  42. GRB 090813: Swift-XRT refined analysis
  43. Fermi Gamma-ray Burst Monitor trigger 271833016 is not a GRB
  44. GRB 090813, Swift-BAT refined analysis
  45. Konus-Wind observations of GRB090813
  46. GRB090813: Swift/UVOT upper limits
  47. GRB 090813: Enhanced Swift-XRT position
  48. GRB 090813: Liverpool Telescope afterglow confirmation
  49. GRB 090813: P60 Optical Afterglow Confirmation
  50. GRB 090813: optical candidate from 1.23m CAHA telescope
  51. GRB 090813: Swift detection of a burst
  52. GRB 090812: WIRO NIR upper limit
  53. GRB 090812: Faulkes Telescope South Continued Optical Monitoring
  54. GRB 090812: RAPTOR detections during the burst
  55. GRB 090812: Swift XRT refined analysis
  56. GRB 090812, RIMOTS optical upper limits
  57. GRB 090812 Swift-BAT Refined Analysis
  58. GRB090812: Swift/UVOT observations
  59. GRB 090812: GROND Observations of the Optical/NIR Afterglow
  60. GRB 090812: Enhanced Swift-XRT position
  61. GRB 090812 VLT redshift
  62. GRB 090812: Liverpool Telescope afterglow confirmation
  63. GRB 090812: P60 Confirmation of Optical Afterglow
  64. GRB 090812: Swift detection of a burst with an optical counterpart
  65. GRB 090807B: Fermi GBM detection
  66. GRB 090809: Further NOT optical observations
  67. VLA radio upper limit on GRB 090809
  68. GRB 090621B: MAGIC telescope GeV observation
  69. GRB 090621A: MAGIC telescope GeV observation
  70. GRB 090809: WHT observations
  71. GRB 090809 X-shooter redshift
  72. GRB 090809B: Fermi GBM detection
  73. GRB 090809: Swift-XRT refined analysis
  74. GRB090809: Swift/UVOT observations
  75. GRB 090809: Enhanced Swift-XRT position
  76. GRB 090809: Swift-BAT refined analysis
  77. GRB 090809: afterglow confirmation at the NOT
  78. GRB 090809: Swift detection of a burst with a possible optical counterpart
  79. GRB 090807: Liverpool Telescope observations
  80. GRB 090807: MITSuME optical upper limit
  81. GRB 090807: Swift/UVOT Upper Limits
  82. GRB 090807: Swift-XRT refined analysis
  83. GRB 090807, Swift-BAT refined analysis
  84. GRB 090807: Enhanced Swift-XRT position
  85. GRB 090807, RIMOTS optical upper limits
  86. GRB 090807: Swift detection of a burst
  87. Fermi Gamma-ray Burst Monitor trigger 271275771 is not a GRB
  88. GRB 090802B: Fermi GBM detection
  89. IPN Triangulation and Konus-Wind observaions of GRB090727B
  90. GRB 090802: Fermi GBM detection
  91. GRB 090726: optical observation
  92. Swift-BAT trigger 358760 is most likely not a GRB
  93. Swift trigger 358760 is probably a noise event
  94. GRB 090717A: Suzaku WAM observation of the prompt emission
  95. GRB 090709A : Quick look analysis of the Suzaku observation
  96. GRB 090728: Swift-BAT refined analysis
  97. GRB 090727: GRT Optical Observation
  98. GRB 090728: Swift XRT refined analysis
  99. GRB 090727: optical observations
  100. GRB 090726: GRT Optical Observation

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